/* ============================================================
   DESIGN SYSTEM — "PAPER PRESS / 纸上排版"
   Palette: cream paper · deep indigo ink · coral · mint · lilac
   Language: editorial offset-print, hard shadows, sticker UI
   ============================================================ */

:root{
  --paper:#FBF7F0;
  --paper-alt:#F2ECE2;
  --paper-lilac:#EFE9F7;
  --ink:#241F3D;
  --ink-soft:rgba(36,31,61,.64);
  --ink-faint:rgba(36,31,61,.12);
  --coral:#F0523A;
  --coral-deep:#CE3A24;
  --mint:#57CFAE;
  --mint-tint:#E2F7F0;
  --lilac:#B9A6E8;
  --lilac-tint:#EFE9FA;
  --sun:#FFC24B;
  --sun-tint:#FFF4DC;
  --card:#FFFFFF;
  --r-sm:12px;
  --r-md:18px;
  --r-lg:28px;
  --hard:6px 6px 0 var(--ink);
  --hard-sm:4px 4px 0 var(--ink);
  --soft:0 22px 44px -26px rgba(36,31,61,.5);
  --ease:cubic-bezier(.22,1,.36,1);
}

/* 基础重置 */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background-color:var(--paper);
  background-image:radial-gradient(rgba(36,31,61,.055) 1px, transparent 1px);
  background-size:20px 20px;
  color:var(--ink);
  line-height:1.68;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{ max-width:100%; display:block; }
a{ color:inherit; }
::selection{ background:var(--sun); color:var(--ink); }
:focus-visible{ outline:3px solid var(--coral); outline-offset:3px; border-radius:4px; }
html{ scroll-behavior:smooth; }

/* 核心布局 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:104px 0; position:relative; }
.section:nth-child(even) { background:#F7F3EC; }

/* 导航 — 固定顶部 */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(251,247,240,.82);
  backdrop-filter:blur(14px) saturate(160%);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  border-bottom:1px solid var(--ink-faint);
}
.site-header::after{
  content:''; position:absolute; left:0; bottom:-1px; height:3px; width:38%;
  background:linear-gradient(90deg,var(--coral),var(--sun) 50%,var(--mint));
  border-radius:0 3px 3px 0;
}
.header-inner {
  display:flex; align-items:center; justify-content:space-between;
  height:68px; max-width:1200px; margin:0 auto; padding:0 24px;
}
.logo {
  display:flex; align-items:center; gap:10px;
  font-weight:900; font-size:1.15rem; letter-spacing:-.02em;
  text-decoration:none; color:var(--ink);
}
.logo-icon {
  width:38px; height:38px; border-radius:11px;
  display:flex; align-items:center; justify-content:center;
  font-size:1.05rem; line-height:1;
  background:var(--coral); color:#fff;
  border:2px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-4deg);
  transition:transform .35s var(--ease);
}
.logo:hover .logo-icon{ transform:rotate(6deg) scale(1.05); }

.main-nav { display:flex; align-items:center; gap:28px; list-style:none; }
.main-nav a {
  position:relative; text-decoration:none;
  font-size:.92rem; font-weight:600; letter-spacing:.01em;
  color:var(--ink-soft); transition:color .25s var(--ease);
  padding:4px 0;
}
.main-nav a::after{
  content:''; position:absolute; left:0; bottom:-2px; height:2px; width:0;
  background:var(--coral); border-radius:2px;
  transition:width .35s var(--ease);
}
.main-nav a:hover{ color:var(--ink); }
.main-nav a:hover::after{ width:100%; }

.nav-cta {
  padding:9px 20px !important; border-radius:11px;
  background:var(--mint); color:var(--ink) !important;
  font-weight:800 !important;
  border:2px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transition:transform .25s var(--ease), box-shadow .25s var(--ease), background .25s;
}
.nav-cta::after{ display:none; }
.nav-cta:hover{
  transform:translate(-2px,-2px);
  box-shadow:5px 5px 0 var(--ink);
  background:var(--sun);
}
.menu-toggle {
  display:none; width:42px; height:42px; align-items:center; justify-content:center;
  background:#fff; border:2px solid var(--ink); border-radius:11px;
  box-shadow:3px 3px 0 var(--ink); cursor:pointer; font-size:1.1rem;
}

/* 首页 Hero */
.hero {
  min-height:70vh; display:flex; align-items:center;
  padding:150px 0 90px; position:relative; overflow:hidden;
}
.hero::before{
  content:''; position:absolute; z-index:-1;
  width:520px; height:520px; right:-140px; top:-80px; border-radius:50%;
  background:radial-gradient(circle at 35% 35%, var(--sun-tint), rgba(255,194,75,0) 68%);
}
.hero::after{
  content:''; position:absolute; z-index:-1; left:-120px; bottom:-160px;
  width:420px; height:420px;
  background:radial-gradient(circle at 50% 50%, var(--mint-tint), rgba(87,207,174,0) 70%);
  border-radius:50%;
}
.hero-content { max-width:720px; position:relative; }
.hero-eyebrow {
  display:inline-block; font-size:.8rem; font-weight:800;
  letter-spacing:.14em; text-transform:uppercase;
  padding:6px 16px; border-radius:999px; margin-bottom:22px;
  background:var(--lilac-tint); color:var(--ink);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
}
.hero h1 {
  font-size:clamp(2.2rem, 5.4vw, 4.05rem);
  font-weight:900; line-height:1.08; letter-spacing:-.035em;
  margin-bottom:22px; color:var(--ink);
}
.hero h1::first-line{ letter-spacing:-.04em; }
.hero p {
  font-size:1.08rem; color:var(--ink-soft);
  max-width:560px; margin-bottom:36px; line-height:1.8;
}
.hero-buttons { display:flex; gap:16px; flex-wrap:wrap; align-items:center; }
.hero-image {
  border-radius:var(--r-lg); overflow:hidden;
  border:2px solid var(--ink); box-shadow:var(--hard);
  background:#fff;
}
.hero-image img { width:100%; height:auto; }

/* 按钮 */
.btn {
  display:inline-flex; align-items:center; gap:9px;
  padding:14px 30px; border-radius:14px;
  font-weight:800; font-size:.95rem; letter-spacing:.01em;
  cursor:pointer; border:2px solid var(--ink);
  text-decoration:none;
  transition:transform .25s var(--ease), box-shadow .25s var(--ease), background .25s;
  box-shadow:var(--hard-sm);
}
.btn:hover{ transform:translate(-2px,-2px); box-shadow:8px 8px 0 var(--ink); }
.btn:active{ transform:translate(2px,2px); box-shadow:1px 1px 0 var(--ink); }
.btn-primary { color:#fff; background:var(--coral); }
.btn-primary:hover{ background:var(--coral-deep); }
.btn-outline {
  background:#fff; border:2px solid var(--ink); color:var(--ink);
}
.btn-outline:hover{ background:var(--sun-tint); }

/* 标签/标题 */
.section-label {
  display:inline-block; font-size:.76rem; font-weight:800;
  letter-spacing:.24em; text-transform:uppercase;
  margin-bottom:16px; color:var(--coral-deep);
  padding-left:34px; position:relative;
}
.section-label::before{
  content:''; position:absolute; left:0; top:50%;
  width:24px; height:3px; background:var(--coral); border-radius:3px;
  transform:translateY(-50%);
}
.section-title {
  font-size:clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight:900; letter-spacing:-.03em; line-height:1.18;
  margin-bottom:16px; color:var(--ink);
}
.section-desc {
  max-width:600px; color:var(--ink-soft); margin-bottom:48px;
  font-size:1.02rem; line-height:1.8;
}

/* 卡片网格 */
.cards-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:26px; }
.category-card {
  border-radius:var(--r-md); padding:30px 28px;
  border:2px solid var(--ink); background:var(--card);
  transition:transform .35s var(--ease), box-shadow .35s var(--ease), background .35s;
  box-shadow:0 0 0 var(--ink);
  position:relative; overflow:hidden;
}
.category-card:nth-child(3n+1){ background:linear-gradient(180deg,#fff, var(--mint-tint) 180%); }
.category-card:nth-child(3n+2){ background:linear-gradient(180deg,#fff, var(--sun-tint) 180%); }
.category-card:nth-child(3n+3){ background:linear-gradient(180deg,#fff, var(--lilac-tint) 180%); }
.category-card:hover {
  transform:translate(-4px,-4px);
  box-shadow:var(--hard);
}
.card-icon {
  width:52px; height:52px; border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.35rem;
  background:var(--card); border:2px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-3deg);
}
.category-card:nth-child(3n+1) .card-icon{ background:var(--mint); }
.category-card:nth-child(3n+2) .card-icon{ background:var(--sun); }
.category-card:nth-child(3n+3) .card-icon{ background:var(--lilac); }
.card-link {
  display:inline-flex; align-items:center; gap:6px;
  font-weight:800; font-size:.86rem; text-decoration:none;
  color:var(--coral-deep); margin-top:14px;
  transition:gap .25s var(--ease), color .25s;
}
.card-link::after{ content:'→'; transition:transform .3s var(--ease); }
.card-link:hover{ gap:11px; color:var(--ink); }

/* 特性块 */
.feature-block { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center; }
.feature-image {
  border-radius:var(--r-lg); overflow:hidden;
  border:2px solid var(--ink); box-shadow:var(--hard);
  background:#fff;
}
.feature-image img { width:100%; height:auto; }
.feature-text { }
.feature-text h3{
  font-size:1.55rem; font-weight:900; letter-spacing:-.025em;
  margin-bottom:14px; line-height:1.25;
}
.feature-text p{ color:var(--ink-soft); margin-bottom:18px; }
.feature-list { list-style:none; margin-top:8px; }
.feature-list li {
  padding:9px 0; display:flex; align-items:flex-start; gap:12px;
  font-weight:500; color:var(--ink);
  border-bottom:1px dashed var(--ink-faint);
}
.feature-list li:last-child{ border-bottom:none; }
.feature-list li::before {
  content:'✓'; font-weight:900; flex:none;
  width:24px; height:24px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-size:.78rem; color:var(--ink);
  background:var(--mint); border:1.5px solid var(--ink);
  margin-top:2px;
}

/* 数据条 */
.stats-bar { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; text-align:center; }
.stat-item {
  padding:30px 22px; border-radius:var(--r-md);
  border:2px solid var(--ink); background:#fff;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease);
}
.stat-item:nth-child(1){ background:var(--mint-tint); }
.stat-item:nth-child(2){ background:var(--sun-tint); }
.stat-item:nth-child(3){ background:var(--lilac-tint); }
.stat-item:nth-child(4){ background:#FCE9E4; }
.stat-item:hover{ transform:translateY(-6px); box-shadow:var(--hard); }
.stat-number {
  font-size:clamp(2rem, 4vw, 2.75rem);
  font-weight:900; letter-spacing:-.045em; line-height:1;
  font-variant-numeric:tabular-nums;
  color:var(--ink);
}
.stat-item:nth-child(odd) .stat-number{ color:var(--coral-deep); }
.stat-label {
  font-size:.86rem; color:var(--ink-soft); margin-top:10px;
  font-weight:600; letter-spacing:.06em;
}

/* 内容墙 */
.content-wall { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:26px; }
.content-wall-item {
  border-radius:var(--r-md); overflow:hidden;
  border:2px solid var(--ink); background:#fff;
  transition:transform .35s var(--ease), box-shadow .35s var(--ease);
}
.content-wall-item:hover { transform:translate(-4px,-4px); box-shadow:var(--hard); }
.content-wall-item img {
  width:100%; height:200px; object-fit:cover;
  border-bottom:2px solid var(--ink);
  filter:saturate(108%);
}
.content-wall-body { padding:22px; }
.content-wall-body h4{
  font-size:1.05rem; font-weight:800; letter-spacing:-.015em;
  margin-bottom:8px;
}
.content-wall-body p{ font-size:.9rem; color:var(--ink-soft); }

/* FAQ */
.faq-list { max-width:820px; margin:0 auto; }
.faq-item {
  border:2px solid var(--ink-faint); border-radius:16px;
  margin-bottom:12px; overflow:hidden; cursor:pointer;
  background:#fff;
  transition:border-color .3s var(--ease), box-shadow .3s var(--ease), transform .3s var(--ease);
}
.faq-item:hover{ border-color:var(--ink); transform:translateX(4px); }
.faq-item.open{
  border-color:var(--ink); box-shadow:var(--hard-sm);
  transform:translateX(0);
}
.faq-item .faq-question {
  padding:20px 24px; font-weight:800; font-size:1rem;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
  letter-spacing:-.01em;
}
.faq-item .faq-question::after{
  content:'+'; flex:none;
  width:28px; height:28px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-size:1.1rem; font-weight:800; line-height:1;
  background:var(--sun); border:1.5px solid var(--ink);
  transition:transform .35s var(--ease), background .35s;
}
.faq-item.open .faq-question::after{
  content:'−'; background:var(--coral); color:#fff;
  transform:rotate(180deg);
}
.faq-item .faq-answer {
  padding:0 24px 20px; display:none;
  color:var(--ink-soft); line-height:1.85; font-size:.95rem;
  max-width:66ch;
}
.faq-item.open .faq-answer { display:block; animation:fadeUp .4s var(--ease) both; }
@keyframes fadeUp{
  from{ opacity:0; transform:translateY(-6px); }
  to{ opacity:1; transform:translateY(0); }
}

/* CTA横幅 */
.cta-banner {
  padding:64px 32px; text-align:center; border-radius:var(--r-lg);
  color:#fff; position:relative; overflow:hidden;
  background:linear-gradient(118deg, #E8432C 0%, #A24BC9 52%, #4A3AAE 100%);
  border:2px solid var(--ink);
  box-shadow:10px 10px 0 var(--ink);
}
.cta-banner::before{
  content:''; position:absolute; inset:0;
  background-image:radial-gradient(rgba(255,255,255,.16) 1.5px, transparent 1.5px);
  background-size:22px 22px; opacity:.7; pointer-events:none;
}
.cta-banner h2 {
  color:#fff; position:relative;
  font-size:clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight:900; letter-spacing:-.03em; margin-bottom:14px; line-height:1.2;
}
.cta-banner p{ position:relative; opacity:.9; margin:0 auto 32px; max-width:560px; }
.cta-banner .btn-primary {
  background:#fff; color:var(--coral-deep);
  border:2px solid var(--ink); position:relative;
}
.cta-banner .btn-primary:hover{ background:var(--sun); color:var(--ink); }

/* 页脚 */
.site-footer {
  padding:72px 0 28px;
  background:linear-gradient(180deg, var(--paper-alt) 0%, var(--paper-lilac) 100%);
  border-top:2px solid var(--ink);
}
.site-footer .container { }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:44px; }
.footer-brand { }
.footer-brand .logo{ margin-bottom:16px; }
.footer-brand p{ color:var(--ink-soft); font-size:.92rem; max-width:34ch; }
.footer-col { }
.footer-col h4{
  font-size:.78rem; font-weight:800; letter-spacing:.2em;
  text-transform:uppercase; color:var(--ink); margin-bottom:16px;
}
.footer-col ul{ list-style:none; }
.footer-col li{ margin-bottom:10px; }
.footer-col a{
  text-decoration:none; font-size:.92rem; color:var(--ink-soft);
  transition:color .22s var(--ease), padding-left .22s var(--ease);
}
.footer-col a:hover{ color:var(--coral-deep); padding-left:6px; }
.footer-bottom {
  border-top:1px solid rgba(36,31,61,.14);
  margin-top:48px; padding-top:22px;
  text-align:center; font-size:.85rem; color:var(--ink-soft);
}

/* 工具类 */
.text-accent { color:var(--coral-deep); }
.text-center { text-align:center; }
.seo-description {
  max-width:600px; margin:0 auto 48px;
  color:var(--ink-soft); line-height:1.85; font-size:1.02rem;
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* 响应式 */
@media (max-width: 768px) {
  .section{ padding:76px 0; }
  .feature-block { grid-template-columns:1fr; gap:36px; }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; gap:32px; }
  .main-nav { display:none; }
  .menu-toggle { display:flex; }
  .main-nav.open {
    display:flex; flex-direction:column;
    position:absolute; top:68px; left:0; width:100%;
    background:#FBF7F0; padding:24px;
    border-bottom:2px solid var(--ink);
    box-shadow:0 18px 30px -20px rgba(36,31,61,.5);
    align-items:flex-start; gap:18px;
  }
  .main-nav.open a{ font-size:1rem; }
  .hero{ padding:130px 0 70px; }
  .cta-banner{ box-shadow:6px 6px 0 var(--ink); padding:52px 22px; }
}
@media (max-width: 480px) {
  .cards-grid,.content-wall,.stats-bar { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
  .hero-buttons { flex-direction:column; align-items:stretch; }
  .btn{ justify-content:center; }
  .hero h1{ font-size:2.05rem; }
  .section{ padding:64px 0; }
  .category-card{ padding:24px 22px; }
}